PDF derived from the foreground-corrected Herschel column-density map. The left y-axis gives the normalized probability density p(η), the right y-axis the number of pixels per log bin. The upper x-axis is the visual extinction and the lower x-axis the natural logarithm of the normalized column density. The green curve indicates the best lognormal fit to the low column-density distribution, the red line displays a linear regression power-law fit to the high column-density tail. The dispersion of the fitted PDF (ση), the slope s and its error, and the exponent α of an equivalent spherical density distribution (C) and a cylindrical density profile, such as for filaments (F), are indicated.
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